`Coast Guard cutter bracket undermatching case`

Brief reference. Undermatching filler metal acceptable here because the brackets had ample weld area, the substrate was high-strength for deflection (not strength) reasons, and undermatching gave better corrosion resistance and toughness.

We just talked about a redeeming social value for undermatching before class — these brackets on the Coast Guard cutters. They had plenty of weld area. They were welding a high-strength steel because they needed a deflection of the beam. But they had plenty of weld area holding it together, so you can go to lower strength. They wanted better corrosion resistance in the weld than any other material. They also wanted toughness, which we'll talk about — we haven't talked a lot about lower-temperature brittle materials. That's one of the problems with the Liberty ships. And it is generally a problem.